Will you add fully documented source code with comments?
I was thinking about non-human characters. How hard is it to reconfigure the code to generate custom bones and skeleton ? Adding as many parameters in blueprints and so methods and variables in C++ to allow for an easy reconfiguration could help a lot. For example an ogre character in a fantasy game would still be humanoid but quite far from human so the skeleton should be reconfigured properly if templates are not available. Same goes for animals. And any character in a sci-fi world or fantasy world that would be designed to be like nothing else would require the bones to be reconfigured as well.
It would be a lot more useful and worth the price if it wasn’t limited to human characters only.